4121609781 has 4 divisors (see below), whose sum is σ = 5495479712. Its totient is φ = 2747739852.

The previous prime is 4121609771. The next prime is 4121609797. The reversal of 4121609781 is 1879061214.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 4121609781 - 2¹¹ = 4121607733 is a prime.

It is a super-2 number, since 2×4121609781² = 33975334373669735922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4121609771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 686934961 + ... + 686934966.

It is an arithmetic number, because the mean of its divisors is an integer number (1373869928).

Almost surely, 2^4121609781 is an apocalyptic number.

It is an amenable number.

4121609781 is a deficient number, since it is larger than the sum of its proper divisors (1373869931).

4121609781 is a wasteful number, since it uses less digits than its factorization.

4121609781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373869930.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 4121609781 is about 64199.7646491013. The cubic root of 4121609781 is about 1603.3276811892.

The spelling of 4121609781 in words is "four billion, one hundred twenty-one million, six hundred nine thousand, seven hundred eighty-one".